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3 Sheets-Sheet 1.

, f v JTM HARTMAN. OVEN 0R STOVE FOR HEATING THE BLAST 0F BLAST FURNACES. No. 105,678. v Patented July 2 1870.

3 She tsSheet 2.

Patented July 26 1870 3mm %%J @MMWJ J M HARTMAN OVEN 0R STOVE FOR HEATING THE BLAST 0 15 BLAST FURNAGES.

1 3 Sh eets+Sheet 3. 'J.M. HARTMAN. HEATING THE BLAST 0F BLAST FURNACES.

Patented July 26, 1870.

old furnacesnow in use.

Q idnitcd ,%tat25 v GEORGE W. I WHITAKER.

Lam 19m: No. 105,678, dated July 26, 1870.

IMPROVEMENT m ovnns on smovns ron HEATING was BLAST or BLAST-.FUR-

1 micns.

s The Schedule referred to in these Letters Patent and making part of the name.

To all whom it may concern: 7

' Be'it known that I, J one; M. HARTMAN, of the city and county of Philadelphia and State of Pennsylvania, have inventedImprovements in Ovens or Stoves for Heating the Blast of Blast-Furnaces; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being bad to the accompanying drawing and to the letters of reference marked thereon.

Y My invention consists- First, in dividing the flame which heats'tbe siphons of a blast-heating stove or oven of blast-furnaces, that it may impinge on theonter as well as on the inner surface onedge of each leg, and thereby heat the meta of the same uniformly, and prevent it from cracking by unequal expansion, and also from burning-on the inner surface or edge.

Second, in dividing or separating the adjacent legs of contiguous transverse siphons by gas-openings.

7 0n reference to the accompanying drawing and to the letters of referencemarked then-on, making part of this specification- Y Figure 1 is a perspective view of the bed-pipes and siphons of a blast-heating stove or oven, showing my j invention;

Figure 2 is a sectional end view of a blast-heating stove or oven with my improvements; and

Figure 3 is a sectional end view of a blast-heating stove or oven, being the construction of almost all the views.

' A are the bed-pipes of a blast-heating stove or oven, and A B the siphons, the legs of which are placed transversely to the bed-pipes, in the direction of the line a 12, fig. 1, and securely cemented in sockets.

The blast enters one of the ends of the bed-pipes and ascends and descends the siphons,-thus insuring the passage of the air overall the surface of the stove.

vI-Ierctoiore, as shown in fig. 3, the gas from the gasflue O was admitted to the heating-chamber D through the gas-openings E, between the legs ofeach longitudinal row of siphons. The consequence was, that the inner surface or edge 0 of the legs of each siphon, where the heat played, was heated much greater than Similar letters refer to similar protein the several the outer edge at, where the heat did not impinge; consequently, the expansion being unequal, the legs were cracked and rendered useless. For the same reason the inner edge or surface was burned out, leaving the outer edge perfectly sound. The brick-work was also expanded'hy. the heat, and forced the bed;

pipes apart, which cracked the siphon at its turn, as

shown at e.

My invention divides the bed-pipes A longitudinally, as shown by the dotted line f g, fig. 1, by-means of gas=openings E, not only between the legs of the samesiphon, as by the old method, shown at F, figs. 2 and 3 3 of the accompanying drawing, butitalso divides the adjacent legs-ef the contiguous transverse siphons, (on the transverse lines a b, fig. 1,) as showsat, G,

1 and 2, whereby the surface of each siphondeg'; is entirely exposed to the gas from the gas-openings E, and the heat is more uniformly and evenly distributed.

- 13y distributing the heat around the legs of thc si-' phon, its entire surface expands and'contracts equally, therebypreventing it from spreading and cracking at its point of contact withthe flame.

\Vhen flanges h, fig. 1, are cast on the branches at the ends of the bed-pipes, and bolted or locked to- 'gether, the bed-pipes are prevented from spreading by thecxpansion of the brick walls.

My improvements are only applicable. to bed-pipes where the blast passes transversely from bed-pipe to bed-pipe through the siphons. What I claim as my invention, and .desire to secure by Letters Patent, is-- 1. Dividing the flame or gas of a blast-heating stove or oven, substantially for the purpose shown and described.

2. Dividing the adjacent legs of contiguonstransverse siphons by gas-openings, asshown-and described. y

In testimony whereof I hereunto sign my name in presence of two subscribing witnesses.v j

JOHN M. HARTMAN.

Witnesses:

FRANCIS D. PAsromUs, LOUIS A. Micros. 

